Cytokinesis Transitional Reasoning Download PDF

Questions

1. 1.

   A researcher studies two dividing eukaryotic cultures, Cell Line X and Cell Line Y, to investigate the mechanisms governing cytoplasmic division. The application of cytochalasin, an inhibitor of actin microfilament assembly, prevents the physical separation of daughter cells in Cell Line X without affecting Cell Line Y. Conversely, blocking Golgi-derived vesicle trafficking along microtubule arrays disrupts division specifically in Cell Line Y, resulting in binucleate cells with incomplete partition walls. Based on these observations, which of the following conclusions is best supported regarding the cytokinesis mechanisms of these two cell lines?

   • A) Cell Line X divides through centripetal furrowing mediated by a contractile ring, whereas Cell Line Y constructs a centrifugal cell plate via vesicle fusion.
   • B) Cell Line X forms a cell plate utilizing microtubule-guided vesicular transport, whereas Cell Line Y pinches inward via an actin-myosin contractile ring.
   • C) Cell Line X relies on cell wall synthesis directed from the cell interior outward, whereas Cell Line Y relies entirely on plasma membrane invagination from the periphery.
   • D) Cell Line X exhibits plant-like cytokinesis requiring rigid wall deposition, whereas Cell Line Y demonstrates typical animal cytokinesis dependent on cytoskeletal pinching.